Something weird happened today. After two days of not crashing, it did a hard shutdown on schedule today. This time, as soon as it crashed, I heard a continuous tone, and I couldn't power up again. Turned out to be my UPS was making the sound, and it's light was flashing red. I assume it needs a new battery. I find it a really strange coincidence the the UPS bit the dust at the same time the pc has "normally" been crashing.

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